<form method="post" action="https://www.nganluong.vn/advance_payment.php">
<input type="hidden" name="receiver" value="<?php echo $receiver;?>" />
<input type="hidden" name="product" value="Lập trình mã đơn hàng của bạn vào đây" />
<input type="hidden" name="price" value="<?php echo $price;?>" />
<input type="hidden" name="return_url" value="<?php echo $return_url;?>" />
<input type="hidden" name="comments" value="<?php echo $comments;?>" />
<input type=image src="https://www.nganluong.vn/data/images/buttons/11.gif" />
</form>